Department of Colorectal Surgery;
Croydon University Hospital;
Croydon;
London CR7 7YE;
United Kingdom;
Department of Radiology;
Royal Marsden Hospital;
Sutton SM2 5PT;
United Kingdom;
Pathology and Tumour Biology;
Leeds Institute of Cancer and Pathology;
St. James's University Hospital;
Leeds LS9 7TF;
United Kingdom;
Department of Surgery;
Royal Marsden Hospital;
Fulham Rd;
London SM2 5PT;
United Kingdom;
Tumour; regression; mrT; RG; Poor; response; Neo-adjuvant; therapy; Rectal; cancer;